AFB Series Stainless Steel Chemical Pump

The FB and AFB series are single-stage, single-suction corrosion-resistant centrifugal pumps for media that contain no solid particles, published for liquid temperatures from 0 °C to 120 °C. The published performance envelope is 2–191 m³/h of flow with heads from 5.2 to 70 m, delivered by 2900 r/min close-coupled units.

All parts in contact with the pumped medium are manufactured from 304 stainless steel, so the pump protects the quality and stability of the medium as well as resisting corrosion. Shaft sealing uses an impeller-driven seal arrangement published for this series, which keeps the seal area simple and reduces the number of wearing parts.

The range is built around a family of nominal diameters from 25 mm to 150 mm. For each casing size the FB model is the full-diameter impeller and the AFB model is the trimmed version with lower flow and head, so a single casing can cover several duty points. Efficiency and NPSH are published for every model, which makes the series straightforward to match to an existing pipe system.

• Chemical industry: Transfers corrosive chemical solutions and process liquids free of solid particles.
• Pharmaceutical and fine chemical: Handles process liquids where 304 stainless contact is required.
• Water treatment: Pumps treatment chemicals and process water at temperatures up to 120 °C.
• Dyeing and printing: Circulates dye baths and finishing liquors in textile plants.
• Metallurgy: Serves pickling and rinse circuits where media carry no solids.
• Food and beverage: Transfers liquid products that contain no particles and are compatible with 304 stainless.
• General industry: Acts as a general-purpose transfer and boosting pump in factory services.

1. Read the efficiency column as well as the flow column: within one casing size the FB model gives more flow at lower efficiency, while the AFB model runs closer to its best point at lower flow.
2. Match the NPSH figure of the selected model against the available NPSH at the suction, since the published values fall from 4.0 m on the 25 mm and 40 mm casings to 2.5 m on the 150 mm casing.
3. Confirm the medium temperature sits between 0 °C and 120 °C and that the liquid is free of solid particles, which is the published condition for the series.
4. Choose between FB and AFB to avoid throttling: the trimmed AFB impeller usually meets a lower head duty with a smaller motor.
5. Check the 2900 r/min speed against the available power supply and the noise requirement of the installation area.
6. Ask for the port sizes of the 25, 40, 50, 65, 80, 100 or 150 mm casing before finalising the pipework.